Implement event/response roundtrip (#49)

client/web/wasm/src/lib.rs

@@ -4,23 +4,27 @@ pub mod viewport;
 pub mod window;
 pub mod wrappers;
 
-use graphite_editor_core::Editor;
+use graphite_editor_core::{events::Response, Callback, Editor};
 use std::cell::RefCell;
 use wasm_bindgen::prelude::*;
 
 // the thread_local macro provides a way to initialize static variables with non-constant functions
-thread_local! {pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new())}
+thread_local! {pub static EDITOR_STATE: RefCell<Editor> = RefCell::new(Editor::new(Box::new(handle_response)))}
 
 #[wasm_bindgen(start)]
 pub fn init() {
 	utils::set_panic_hook();
 }
 
-/// Send events
-#[wasm_bindgen]
-pub fn handle_event(event_name: String) {
-	// TODO: add payload
-	todo!()
+fn handle_response(response: Response) {
+	match response {
+		Response::UpdateCanvas => update_canvas(),
+	}
+}
+
+#[wasm_bindgen(module = "/../src/wasm-callback-processor.js")]
+extern "C" {
+	fn update_canvas();
 }
 
 #[wasm_bindgen]

client/web/wasm/src/viewport.rs

@@ -1,6 +1,7 @@
 use crate::shims::Error;
 use crate::wrappers::{translate_tool, Color};
 use crate::EDITOR_STATE;
+use graphite_editor_core::events;
 use wasm_bindgen::prelude::*;
 
 /// Modify the currently selected tool in the document state store
@@ -15,10 +16,22 @@ pub fn select_tool(tool: String) -> Result<(), JsValue> {
 	})
 }
 
+static mut POS: (u32, u32) = (0, 0);
+
 /// Mouse movement with the bounds of the canvas
 #[wasm_bindgen]
 pub fn on_mouse_move(x: u32, y: u32) {
-	todo!()
+	// SAFETY: This is safe because the code can only ever run in a single thread
+	unsafe {
+		POS = (x, y);
+	}
+}
+
+/// Mouse click within the bounds of the canvas
+#[wasm_bindgen]
+pub fn on_mouse_click(x: u32, y: u32) -> Result<(), JsValue> {
+	let ev = events::Event::Click(events::MouseState::from_pos(x, y));
+	EDITOR_STATE.with(|editor| editor.borrow_mut().handle_event(ev)).map_err(|err| Error::new(&err.to_string()).into())
 }
 
 /// Update working colors